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• iPhone / Cocoa - Are NSThreads less efficient than POSIX threads, or is the diff negligable?

  - by jtrim

  I'm looking at putting together a high-performance multi-threaded iPhone app that's doing a couple of fairly high-intensity operations concurrently. Is the performance difference between NSThread and POSIX threading enough to care about here? If so, I would assume POSIX threads would be more efficient because it bypasses the obj-c overhead. Is this correct?

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• How to make tabbar visible when opening a mail view in iphone?

  - by Warrior

  I am new to iphone development.I want to create a tab bar with 5 view.In one view i should be able to open a mail composer.I am able to open the composer but mail composer view , i am not able to see the tab bar.How can i achieve that.Thanks.

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• Ok to implement backend/shared functionality for iPhone in JavaScript?

  - by John Wright

  Is it ok to use the Webkit Javascript engine to implement cross-platform, non-GUI backend functionality on the iPhone, iPad? In my case, I was interested in re-using Javascript code that I have that works on top of SQLite. I thought I would need to re-implement the logic in Obj-C but perhaps I could just share it and expose some hooks into Obj-C using JSCocoa or straight through JavaScript core. Is this legal per Apple guidelines?

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• iPhone Mapkit: How can I get a real business name/address from a longitude/latitude?

  - by vavajo

  I'm writing an iPhone application and trying to determine how to find a business name/address from a user's current GPS location (longitude/latitude). For example, if someone if using the application from inside a Starbucks, how can I find this out from their location? Is there a way to do this using mapkit or any API/Webservice? Many Thanks!

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• What is the best way to create continuously looping background in iPhone SDK ?

  - by catpad

  What is the best way to create a continuously looping background using iPhone SDK so that it seems the foreground object is in perpetual motion ? I have a background image which I want to move continuously at a given speed from right to left and seamlessly start displaying the beginning of the image when its end is reached. What is the best, most efficient way to do it to avoid any jumps and get optimal performance ?

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• On iPhone, what does EPERM (errno == 1) mean in reponse to send() of UDP data?

  - by Chris Markle

  We sending data over UDP from the iPhone, sometimes, but not always, in response to our first send() of UDP data, we are getting back a -1 return code and errno set to 1 (EPERM / operation not permitted). The EPERM result for send(), sendto() and sendmsg() is not documented in the man pages as a return result from those functions. Has anyone out there encountered this and might be able to shed some light on what this errno value means in this context?

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• How to get public key from a certificate in iPhone programe?

  - by user104667

  Now I have a certificate which includes a public key,i want to get the public key from it in iPhone SDK programming, and encrypt a string by RSA with the public key.What should i do? Please help me!!Thanks very much.

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• How to check whether the cell has a subview or not in iphone?

  - by Warrior

  I am new to iphone development.I have a view called barView which is added as the subview to the cell, if want to check for the condition like this if(cell has a subview barview) { do something....... }else { do something...... } How can i check like this, please help me out.Thanks.

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• Custom login form to Facebook on an iPhone app.

  - by VansFannel

  Hello. I'm trying to make an application that can connecto to facebook. I've found Facebook Connect for iPhone and I don't like the login form that it has. Is there any way to make a custom login form? Is there some api functions to call to login an user on Facebook? Thank you.

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• iphone sdk - why is the video returned not full res?

  - by ADAM

  im developing an app for the iphone and im able to get a video using a UIImagePickerController the problem is that the video thats returned by the UIImagePickerControllerMediaURL is not full resoultion -- its only 480 x 360 as opposed to 640 x 480 like the videos that sync to my itunes. -please someone tell me this is not a limitation of the current sdk? - how can i work around it and is there a way to set the uiimage picker so its taking full res video?

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• Is it possible to decode an MMS+WMA2 stream using audio units on the iPhone?

  - by Nick Toumpelis

  I am not sure whether audio units can work as codecs in a streaming audio scenario on the iPhone. I've read in various places that it can be done, but I haven't seen any examples or proper documentation for that. Instead, I find that most of the apps released have utilised ffmpeg and libmms. I appreciate any help or pointers you can give me.

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• How to convert a video via ffmpeg to an mp4 format that will stream and/or download to iPhone and Bl

  - by Yegor

  I have a site where people upload videos, which are converted to .flv format. Simple. I wanted to also convert to an mp4 format that will "stream" to an iphone and blackberry, or allowed to be downloaded to either, for later viewing. Can someone post a working ffmpeg line to accomplish this task? Closest I got was this (which doesn't work) ffmpeg -i in.avi -f mp4 -vcodec libx264 -maxrate 1000 -qmin 3 -qmax 5 -bufsize 4096 -g 300 -acodec libfaac -s 480x320 -ab 128k -qscale 7 out.mp4

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• How to perform an NTLM challenge on the iPhone.

  - by toast

  I'm trying to access some web services in an iPhone application. If I GET to the .asmx page, I authenticate and get the WSDL as expected. However, if I POST to the .asmx page, setting the SOAPAction, Content-Type, Content-Length, and HTTPBody, I just keep getting didReceiveAuthenticationChallenge messages. Additionally, I'm trying to POST to IIS using Integrated Windows Authentication (IWA), which means I'm trying to negotiate an NTLM challenge.

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• Does Objective-C have garbage collector on the iPhone?

  - by user208662

  Hello, I'm thinking of writing an app for the iphone. But I'm confused in regards to the objective-c language. Am I correct in saying that I have to do my own memory management? Is Objective-C a managed language such as C# and/or Java? Thank you!

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• how to check gps singal whether is avliable on iPhone ?

  - by Robin

  as topic... I try to use the didError method , but it does not works ... if I am in room , the iPhone sdk seem insist try to got the location as it could in my app, even the value is not accurate ... how to deal with such problem ? thanks for your help in advance . Regards

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• How do I make a JQuery Slider-like feature on iPhone/Android web app?

  - by alex

  In the iPhone or Android, if you have a JQuery Slider, it doesn't quite work (touchscreen will move the screen instead of drag the slider.)

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• Can I access the keychain on the iPhone with MonoTouch?

  - by TrolleFar

  Hello, I have recently started to develop applications for iPhone with MonoTouch and have to store user names and passwords on the phone. I want to use the keychain for this but can't find anything in the MonoTouch documentation about it. Is it possible to use it directly with MonoTouch or will I have to write some C++/C/Objective-C code that uses the keychain and export it to MonoTouch?

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• iphone location works in simulator with local code but not on server?

  - by princyp

  so this is really weird to me but my code works properly for getting the geolocation if I run my code locally in the simulator, If I have the code on my server it does not work in the simulator, yet the same url and code on my server works on my actual iphone? It seems to not pick up on the geolocation javascript when its on my server in the simulator?

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• Iphone newb Question - How to export information to a website?

  - by Rob

  I am a new iphone developer and was wondering if I could get some help with some code. I just want to know how to export basic character strings and variables to a website to be used by a third-party program. Basically, if I had something as basic as: int variableOne; int variableTwo; What code would I use to export these variables to a website?

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• Where can I find the xcode template for opencv on iPhone ?

  - by apple.dev

  I want to use opencv frequently for iPhone development, so if there is existing xcode template , that will save me a lot time. Also for others who have same purpose. If not, I need to do it myself. Thanks for let me know if you know.

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• iPhone 4.0 API to invoke the phone lock screen?

  - by me2

  Is there an API with the latest 4.0 SDK or earlier that allows an app to programatically invoke the iPhone's lock screen (the one that says "Slide to Unlock") ?

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• Best practices to compile an iPhone app optimizing it for maximum speed?

  - by unforgiven

  I was wondering what people is doing in order to compile their iPhone applications optimizing them for maximum speed rather than size or the tradeoff speed versus size.

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• Are the iPhone media playback controls available to other applications?

  - by Comma

  what is the transparent modal window that has the playback controls in the music player (iPod) of the iPhone? how can i use it in my app?

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• How to build a library for both iPhone simulator and device?

  - by iPhoney

  I want to build a static library for iphone. I want to give my users the .a library which they can use for both simulator test and device test. Do I have to build two library in simulator mode and device mode? Is there any way to build a single one that can be used for both platforms?

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• SDKs disapearing when installing new versions of XCode with Iphone SDK ?!

  - by elementsense

  Hi Why are old SDKs beeing removed when installing a new version of xcode with new Iphone SDK ? Now we have v4, what settings do I have to make in order that the apps still work with 3.x ? Thanks

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